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 <head>

  <title>CSS Test: inherit applied on margin set with em</title>

  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" />
  <link rel="help" title="4.3.2 Length" href="http://www.w3.org/TR/CSS21/syndata.html#length-units" />
  <link rel="help" title="6.2.1 The 'inherit' value" href="http://www.w3.org/TR/CSS21/cascade.html#value-def-inherit" />
  <link rel="help" href="http://www.w3.org/TR/css-cascade-3/#inherit" />
  <link rel="help" href="http://www.w3.org/TR/css-cascade-4/#inherit" />
  <link rel="help" title="8.3 Margin properties" href="http://www.w3.org/TR/CSS21/box.html#margin-properties" />
  <link rel="match" href="margin-em-inherit-001-ref.xht" />

  <meta content="The 'em' unit is equal to the computed value of the 'font-size' property of the element on which it is used. When inherit keyword is used, the property takes the same computed value - a length value in this testcase - as the property for the element's parent." name="assert" />
  <meta content="image" name="flags" />

  <style type="text/css"><![CDATA[
  body {margin: 8px;}

  p
  {
  font: 1em/1.25 serif;
  margin: 1em 0em;
  }

  div#grand-parent {width: 600px;}

  div#parent
  {
  background-color: green;
  border: white solid 6px;
  /*
  Such border prevents margin collapsing between
  #parent's vertical margins and #child's vertical margins
  */
  font-size: 28px;
  margin: 2em 3em 1em 4em; /* 56px 84px 28px 112px */
  }

  div#child
  {
  font-size: 40px;
  margin: inherit;
  /*
  What is inherited is a computed length value: so
  it is 56px 84px 28px 112px and not 80px 120px 40px 160px
  */
  }

  div#abs-pos-overlapping-green
  {
  left: 238px;
  position: absolute;
  top: 174px;
  }

  /*
       8px (body's margin-left)
   + 112px (#parent's margin-left)
   +   6px (#parent's border-left)
   + 112px (#child's margin-left)
  ==================
     238px
  */

  /*
      16px (max(8px, 16px): body's margin-top collapses with p's margin-top)
   +  20px (first line)
   +  20px (second line)
   +  56px (max(16px, 56px): p's margin-bottom collapses with #parent's margin-top)
   +   6px (#parent's border-top)
   +  56px (#child's margin-top)
  ==================
     174px
  */
  ]]></style>

 </head>

 <body>

  <p>Test passes if there is a filled green<br />
  rectangle and if there is no red.</p>

  <div id="grand-parent">
    <div id="parent">
      <div id="child"><img src="support/100x100-red.png" alt="Image download support must be enabled" /></div>
    </div>
  </div>

  <div id="abs-pos-overlapping-green"><img src="support/swatch-green.png" width="100" height="100" alt="Image download support must be enabled" /></div>

 </body>
</html>
